{
  "bibcode": "2010GCN.10990....1P",
  "body": "GRB 100725B: Swift/UVOT Upper Limits\n\nT. A. Pritchard (PSU) and W. H. Baumgartner (GSFC/UMBC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 100725B\n87 s after the BAT trigger (Baumgartner et al., GCN Circ. 10983).\nNo optical afterglow consistent with the XRT position\n(Goad et al., GCN Circ. 10986) is detected in the initial UVOT\nexposures.  Preliminary 3-sigma upper limits using the UVOT\nphotometric system (Poole et al. 2008, MNRAS, 383, 627) for the\nfirst finding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite(FC)           87          237          147 >20.8\nu(FC)              300          549          246 >20.4\nwhite               87         6844          664 >21.4\nv                  629         5882          244 >19.6\nb                  555         6703          432 >20.5\nu                  300         6498          659 >20.2\nw1                 678         6293          432 >20.3\nm2                 653         6088          432 >20.1\nw2                 605         5677          255 >20.1\n\nThe values quoted above are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.09 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 10990,
  "createdOn": 1280098852000,
  "email": "tapritchard@astro.psu.edu",
  "subject": "GRB 100725B: Swift/UVOT Upper Limits",
  "submitter": "Tyler Pritchard at PSU  <tapritchard@astro.psu.edu>",
  "eventId": "GRB 100725B"
}